carpenter



(No Model.)

H. H. CARPENTER. ELEGTRODE FOR SECONDARY BATTERIES.

HANG. 421,666. y Patented Feb. 18, 1890.

l u l n wal.

In 'IIL Fig. 3 is a vertical section of the machine for drawing out the envelope from molten metal inclose the active matter.

tion showmgmethod of sealing up the case -the different connected.

vlarly to that sort in which the'active matter secondary-battery plate. Fig. 2 is a cross-sec- 'UNITED ELECTRQDE FOR SEC OF NEW' YORK, N. Y.V

ONDARY BATTERIES.

SPECIFICATION forming part of Letters Patent No. 421,666, dated February 18, 1890.

Application tiled .ecember 2, 1889.

To all whom zit may concern.-

Be it known that I, HIRAM H. CARPENTER, a citizen of the United States of America, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Secondary or Electric Storage-Batteries, of which the following is a speciicatiomreference being had therein to the accompanying drawings.

My invention relates to the formation, constructiomand protection of plates for secondary or electric storage-batteries, and particuis'inclosed in a supporting case or envelope, and the electrolyticuid is brought into contact with the active matter by means of perforations through the plate, such as is described in the Letters Patent of the United States, No. 412,797, issued to me and bearing date. October 15, 1889./

In the drawings, letters of like name and form refer to like part-s in each of the iignres. ,y

The object of my present invention is to provide a supporting case or envelope for the active matter which will be practically indestructible. and at the same time combine the greatest etlciency with a minimum of weight..

Flgnre l is 1an elevation of lmy improvedl tion thereof through the line ww of Fig. 1.

under hydraulic pressure. Figfll is a crosssection of the same machine on the line y y, showing the shape of the mandrel and the forming-die. Fig. 5 is an elevation showing the tubularenvelope after it has come from the drawing-machine cutinto suitable lengths and showint7 the various incisions necessary to fashion tI e tubular envelope so that it will Figo' is an eleva# or envelope after the active matter has been placed within it. Fig. 7 shows a cross-section of. the plate represented in Fig. 6 after prQtecting-coating.

Arepresents theenvelope or case. f'

B represents the post by means o1, which plates of a cell are electrically sean No. 332,251. (No moan.)

which the envelope A frommolten metal under'hy draulic pressure.

a, represeuts'the mandrel, and b represents the hydraulic plunger.

c c show the incisions in the envelope A, by

nieansof which the upper portion of the cnvelope is fashioned so as to inclose the active matter and at the same time form the connecting-post B integral with the envelope A. The closure at the bottom of the plate is'made in Substantially the same manner as at the top. except that it is not necessary there to provide for the conuectingpost.

d show the pins extending through the flaps formed by the incisions c c", by means of which the folds are kept in place..

e shows the protecting-coating with whichl I coverthe exterior surface of the envelope A.

Heretofore one of the difficulties attending the use of secondary or electric storage-batteries has beenthe rapid disintegration of the inactive matter by reason of the 'corrosion of t-he metal by the electrolytic iiuid. I have discovered kthat if the metal be rendered very hard by compression its condition as to its capacity to resist the corrosive actiony is very much improved. Cast-lead, .which has been much used ior the purpose, is honeycolnbed with minute indentations, the mass is spongy, and aiords opportunity for the corrosive action of the electrolytic iin-id in which it is immersed. Metal rolled into sheets under moderate pressure is slightly improved but when thc metal is subjected tov 'very' great pressure it becomess'olidified, its

spongy condition altogether disappears, and it then protected by a coating ot' asphalt ora plumbic oxide `deposited from a hot solution of litharge and caustic soda it becomes practically indestructible, and eiectually resists the corrosive action of the fluid. Another desideratum in such batteries is that the ratio of weight of the inactive matter to thatof the active matter should be as small as possible,

.and the method otmanufacture of the plate which I have invented. enables the use of a IOO very thin and consequently very light ervelope or cree..-

The formation, construction, and protection of the platee proceeds by the following steps:

The metal of which the-envelope is to be mede is molten and introduced into the flask of the machine for drawing out the envelope surrounding the mandrel oz. The plunger b is a, tube Whose exterior surface exactly fits into the retort and Whose inner surface forme the exterior surface ofthe envelope. The diameter of the bore oi the die exceeds the diemeter of the mandrel by the measurement which may have been determined uponfor the thickness of 'the wall of thefenvelope In my proceee I make the relation of the di` Amieter of the bore ci the die to that of the mandrel euch that e. very thin wall lto the tubular envelope is the result. The molten metal having been introduced into the aek the plunger b is causedV to descend by hydranlic pressure and the molten metal is forced upward into the die around the mandrei, tud in this manner the tubular envelope is fashicned"to any desired length. y

I am eweire that many machines have been in use for the drawing of tubes from molten liquid, and mn nwere that Where the weil of the tube ie required to be thin great pressure ,nlnet he. imparted to tixedia, end I therefore do not claim, broadly, the procese or eppuretus foi` mrning this tube in the Trey specified, only claiming the application oi' this or sonic analogous device for theproduction of e thin tube of greetdensity and consequent solidity tothe' nanufacture of betteryplete enve.

lopen of thesort hereinheiore epeciiied.

I am were that ordinary lead. v'pipe heeV been need es e casing or support for the eet-4 ive matter in storage-batteries; but the eeeing which I propose ie prepared under very much greater pressure, whereby the metal becomes extremely dence and et .the same time it is lighter sind Stronger.

The tubular envelope having been formed by the ehovedeecribed process ie then in con dition to he out up into eny length thntmey he deeired. This tende to economy in 'menufecture, for the platee may heont to .any length from the sume tube, and the necee'eity of diierentdiee und apparatus for euch eine of plete ie avoided. lincisiione c c' are then made in the section of the tubing, the .part ecroeeilie thickneee ci? the upper portion at the corner vrhcrethe poet B is not located being entirely removed, Etselee are the seme portions et the corriere otthe bottom of the .a tube, the part not integral with. the onvc leolidly ineloeed inthe envelope l n;

Huid inftlio usual wey.4

@emga t envelofne to facilitate the folding of the finpe [Without euperimposing one part upon the other. lhe envelope ie then filled with the active nef-liter. The flepe formed bythe incisiont are folded down, ne plainly chown in Fig. 6. The pine d are then inserted to retain the. fifties in place, or the edges may be held by 'buioingr The small flap shown the upper lefffhnd cerner is then formed i opeeuee beingjoinedfthereto by here thus forming the poet hl 'or n eupport 't for. The uotive metter heving thun the exterior enrece en electricnll coating or peint e, having; the chrmice ity of reeisting' thenction of the clee y duid. rihe time is now in reedinete to be perforeted vehicle. is eccolo 'lished thi'eeigh the medium.l of the punchingninchino for which i have received Lettere Patent oi the.

United Stetes, he. 414,288, dated Nove .her 5, 1889. The plateie new ready to he in ed te into a. cell end immereed in the electroiytic Having; thus described my invention, Whitt l claim, end' desire to `secure by Leitern Patent, ie- I l. Thet improvement in the nrt of marking .Secenderyihnttery electredee which coneiete in forming e thin strongly cee'lngj; or Support for the active materiel by submitting nl in e. suiteble mold to e heavy pr" y whereby e easing or support of greet denniiy iin/d durability is obtained, euheteutinlly ne described. y

' 2. In secondary or electric storage .intl teries, an external cese of inactive wetterbering an insulating end acid-resetting emitting applied to itasurfnce.

3. In secondary or Aelectric etoragwhat teries composed of an external ease or enf. velope enden' internal filling of. active mat ter and performed through and through from eideto sidefthe .combination of ein extcmml ense or envelope A, rendered den by eevere compression with en e@ ing or peint e, which 'tent the tricully ineulating enti Y `ier the pnrpeee-intendee, een; scribed. y, l

in tcetirnony ,whereof i ri-i presence ot' two Witte.'

Witnessesi A. G. Sztrroien, WM. K. Erme.

' NTER. 

